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SOVIM
Solar Variability and Irradiance Monitor.
SOVIM is a new instrument based on the SOVA experiment that measured the solar irradiance on board EURECA I. The SOVIM investigation will observe and study the irradiance of the Sun with high precision, stability and accuracy. It will observe the Sun during the sun-pointed 10-15 minutes periods per orbit throughout the entire mission. The Total Solar Irradiance (TSI) will be observed with active cavity radiometers (PM06 and DIARAD) which are traceable to the SI scale of irradiance through direct comparison with cryogenic radiameters on the ground and in vacuum for the PM06, and thorough characterization in the laboratory for the DIARAD. Spectral Solar Irradiance (SSI) measurements will be carried out by spectrophotometers (SPM) of the type which operated successfully on VIRGO/SOHO. A detector based calibration method-directly traceable to the scale established by cryogenic radiometers- will be used to calibrate the SPM with high accuracy